The Good and Bad News About the Amazon River’s Hidden Reef

A hidden coral reef roughly the size of Delaware was discovered at the mouth of the Amazon River. It was a pleasant surprise for scientists, but the reef is already facing threats.

The reef occupies about 3,600 square miles off the shore of northern Brazil and French Guiana, and is hidden under sediment that spills from the Amazon into the Atlantic Ocean. The find came as a surprise to researchers, who say that the combination of mud and fresh water dumped into the ocean by the Amazon sho

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